Sewing-machine having thread-cutting device.



R. L. LYONS. SEWING MACHINE HAVING THREAD CUTTING DEVICE.

APPLICATION FILED MAY 18. 1914.

Patented. July 9, 1918.

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R. L. LYONS.

SEWING MACHINE HAVING THREAD CUTTING DEVICE.

APPLICATION map MAY :3. I914.

1,272,066. PatentedJuly 9,1918.

2 SHEETS-SHEET 2.

. from the, following description.

an, era as ROBERT L. LYONS, WALTHAM, MASSACHUSETTS, ASSIGNOB, TO THE FREDERICK OSANN COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SEWING-MACHINE HAVING THREAD-CUTTING- DEVICE.

Specification of Letters Patent. 7

Patented July e, 1918.-

I Application filed m 18,1914. Serial No. 839,189.

To all whom itmay concern:

'Be it known that I, ROBERT L. .LYoNs, a citizen of the United States, residing at Waltham, in the county of Middlesex and State of Massachusetts, have invented certain new and usefulv Improvements in Sewing-Machines Having Thread-Cutting De- The object of the invention is to so construct' a single thread sewing machine. in

which the sewing thread is sustained as a loop extending from thework around the looper that a. cutting implement may be brought into operation or actuated to cut the arm of said threadloop which extends fromthe stitches to the looper.

Another object of theinvention is to provide a'novel thread cutting mechanism for single threadsewing machines.

Other objects of the lnvention will appear The invention consists in. cutting a loop of the sewing thread while said loop is sustained by the looper. I The invention also consist-sin such other novel features of construction and combina tion of parts as shallhereinaft er be more fully described and pointed out in the claim. Figure 1 represents a side view of portions of a sewing machine illustratingthe now improvement. f f" i Fig. are resents'a bottom plan" view of portions of the same. a Fig. 3, represents 'a plan view of the cam for effecting the movement of the work relative to the stitch forming devices, and also showing means carried by saidcam member through the action of which the thread cutter shifter or actuator may be operated in one direction.

Fig. 4, represents an edge view of a thread cutter device of the preferred form.

Fig. 5, represents a sectional view as taken on line 5-5 Fig. 1 showing the work at the completion of a series of stitches, the thread a-b extendingas a loop from the last stitch around the looper and thence through the work (arm 7) of said thread) to the needle also showing one member of the thread cutting mechanism introduced between said arms a-b of the thread loop and with the thread cutter in position to act to cut the arm 0 upon a subsequent movement of said thread cutter.

' Fig. 6, represents an enlarged diagrammatic sectional view of the thread loop and the cutting implement as taken on line 7-? Fig. 5.

Fig. 7, represents an enlarged diagrammatic view of some of the parts shown in Fig 5 but more clearlyshowing the loca tion of the last'stitch and the needle thread (arm b) extending through said stitch.

Similar characters of reference designate corresponding parts throughout.

The machine shown in the drawings is particularly adapted for the sewing of a group of stitches to attach a tag or ticket T to a piece of material M, but it is not my intention thereby to limit this invention to that class of machines. It is however my intention to limit my invention to a machine in which provision is made to eifect in some manner a relative movement between the work and the stitch forming devices. It being understood that said relative movement between the work may be vibratory for a distance of one or more stitches or continuous in one direction for a series of stitches and that said relative movement between the work and the stitch forming devices is not'limited to the movement of the Work.

As shown in the drawings 5 is the bed plate of the machine having the standard 6 furnished with the arm 7 having the head 8 in which is operatively mounted the needle bar 9carrying the needle 10 which cooperates with the looper 11 at the under side of the bed plate 5 to form chain stitches, so called. Provision of any ordinary means being made 'toefl'ect the operation of said needle andsaid looper ofwhich means the usual shaft 12 having the gear 13 preferably formspart;

At the under side of the bed plate 5 is rotatably mounted the cam disk 14 having the usual pinion which is driven by the gear 13 of shaft 12, in the usual manner to effeet the rotation of said cam disk 14 during the operation of the stitch forming devices. This camdisk 14 has the cam path 16 which may or may not have the dwells 17, 17 and.

and forth movement of the follower 18 engaged in said cam path and connectedinanyusual mannerto the work holder 19 slidably mounted at the upper edge of bed plate 5. This work holder 19 has the cloth plate 20 and the presser foot 21 between which a piece of material M and a tag T, superposed on said material may be engaged and. carried. Y I Adjustably mounted on said cam disk 14; are the cam members 22, 22 which when cam disk 14 rotates, act against the bevel end 23 of the plate 24C which is pivotally mounted and bears against the bent end 25 of lever 26 which lever end 25 is held in contact with pivoted plate 24: spring 27. At its outer'end lever 26 is, pivotally connected with the slide 28 which is received in a guide of'bed plate 5 and has the comparatively narrow shank 29 furnished with the loop spreader member 30 having the thread cutter 31. 1 V I Preparatory to the operation of this ma-v chine material M and a tag T are placed between the members 20 and :21 ofthe work holder or work feedingldevice 19. The machine is then operated and the work T, M, is fed or vibrated laterally with respect to the needle 10 and looper 11 while these stitch forming devices are-operated to effect the formation of securing stitches through said work. The feedingor vibrate ing movement of the work is accomplished, in the construction referred to herein, by or 7 through the rotation of cam disk 14: and its follower 18 connected with said work holder 19 while the cam groove '16 of said'cam disk is acting on said follower. I I

Preferably the cam members 22, 22 are so mounted on the cam disk 14 relative to the cam path 16 and to the bevel end 23 of pivoted plate 2e that after the formation of a predetermined number of stitches one of said :cam members 22 acts against said bevel end 23' of plate 24: and through the swingingof said plate effects the swinging of lever 26 to project the slide 28fo'rward during the upward movement of the needle in completing the next stitch so that the member 30 of the slide28 passesqforward through the arms a,- b of the thread loop while said 'loop is sustained by the ljooper '11 and is under some slight-tension. The

. actuating contact betweenthe members 22 and the bevel end 23 of plate 2& is of; very slight duration so that almost immedlately after the member 30 of slide 28 passesfor- 7 arm a of the loop tendsto draw tighter said stitches. This manner of cutting the thread loop leves a comparatively long end of thread extending from the eye of the needle.

I understand that it is old in the artv to provide, in a two thread machine, a thread cutting finger or member onto which a thread loop is cast from the shuttle as a preliminary step in a thread cutting operation and it is nottmy intention to claim at this time such device or any thread cutting device operating in, combination with a two thread shuttle machine. Ibelieve it to be new however to effect the cutting of "a thread loop, inra single thread sewingfmachine, by the use of. a thread cutting mechanish furnished witha member which'is introduced into said thread loop and coop; crates with a cutting device to cut one arm of said thread loop while said loop is still sustained by the looper, and it is my desire.

to claim such means broadly.

, Having thus described my invention I claim as new and desire to secure by Letters Patent. I

A single thread sewing machine comprising in combination, a needle and a looper, operating means therefor, a work holder, means for effecting relative movement'between said Work holder and said needle, a cutter member slidably mounted and having a loop engaging member and a blade having its edge'positioned to act in the retractivemovement of said cutter member, means toproject said cutter member to introduce its loop engag ng member into a loop of thread sustained by said looper, and spring means toretract said cutter-member to out said loop. 7 p p s 2 ROBERT L. LYONS.

Witnesses 1 v s 2 HENRYVJ. MJLLER, ESTHER C. MURPHY.v

Copies of this patent inay belob tainegll forfive cents each, by addressing the fflommissioner of Patents,

:Waslrinton, D. G. 

